I finally made the Symetrix Express 8x8 Cobra to work. It needed all the elyts and fan replaced. I put together just a quick 3 way stereo crossover, eq and mono to stereo switch. I noticed it provides some analog and digital inputs, so a volume knob and a mute button or maybe even L-C-R matrix coefficient control could be added with just a potentiometer or a switch. The changes are almost realtime through RS232 and it seems to be very low noise.
It has plenty of power for any IIR filter combination I can think of, so tuning the crossovers on it will be fun! In US, they are really cheap for what they are capable of.
It has plenty of power for any IIR filter combination I can think of, so tuning the crossovers on it will be fun! In US, they are really cheap for what they are capable of.
Time to revisit this thread. I finally have some better understanding of Open Sound Meter and did some quick LR6 acoustic crossover using target curves for the Runt Clone. When I used inverse polarity on the tweeter and tuned the delay for deepest notch and inverted back, I got some really nice summation. Also, a pretty useful trick to use is to start with 1/3 octave smoothing. Tomorrow I will try to play a bit more and summarize what I have achieved so far. Magnitude and phase are nice, step response still seems strange as does the impulse response. Maybe that is a property of the IIR LR6 filter and cannot be done better?
If you're going to look only at the correction impulse then it may appear as less than ideal, but if you sum with what you're correcting they can come together properly.
Here's an example, showing the time and frequency components.
https://www.diyaudio.com/community/...fix-resonance-or-ringing-to-advantage.352796/
(EDIT: Perhaps I initially misunderstood the question)
Here's an example, showing the time and frequency components.
https://www.diyaudio.com/community/...fix-resonance-or-ringing-to-advantage.352796/
(EDIT: Perhaps I initially misunderstood the question)